To give a user access to a specific mailing or version, navigate to the mailing or version concerned.  
> Go to the 'Actions' drop down and select 'Settings'  
> Click on the 'User Management' section  
> Scroll down to the 'Access' section  
> Select the user you want to give access to from the drop down menu  
> Click the red 'Allow Access' button.
Any users you select at the mailing level will be able to edit all versions  in the mailing.  
Any users you select at the version level will only be able to edit the specific versions chosen.

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